113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/** \ingroup rpmts
|
|
* \file lib/rpmvercmp.c
|
|
*/
|
|
|
|
#include "system.h"
|
|
|
|
#include <rpmlib.h>
|
|
#include <rpmstring.h>
|
|
|
|
#include "debug.h"
|
|
|
|
/* compare alpha and numeric segments of two versions */
|
|
/* return 1: a is newer than b */
|
|
/* 0: a and b are the same version */
|
|
/* -1: b is newer than a */
|
|
int rpmvercmp(const char * a, const char * b)
|
|
{
|
|
char oldch1, oldch2;
|
|
char * str1, * str2;
|
|
char * one, * two;
|
|
int rc;
|
|
int isnum;
|
|
|
|
/* easy comparison to see if versions are identical */
|
|
if (!strcmp(a, b)) return 0;
|
|
|
|
str1 = alloca(strlen(a) + 1);
|
|
str2 = alloca(strlen(b) + 1);
|
|
|
|
strcpy(str1, a);
|
|
strcpy(str2, b);
|
|
|
|
one = str1;
|
|
two = str2;
|
|
|
|
/* loop through each version segment of str1 and str2 and compare them */
|
|
while (*one && *two) {
|
|
while (*one && !xisalnum(*one)) one++;
|
|
while (*two && !xisalnum(*two)) two++;
|
|
|
|
/* If we ran to the end of either, we are finished with the loop */
|
|
if (!(*one && *two)) break;
|
|
|
|
str1 = one;
|
|
str2 = two;
|
|
|
|
/* grab first completely alpha or completely numeric segment */
|
|
/* leave one and two pointing to the start of the alpha or numeric */
|
|
/* segment and walk str1 and str2 to end of segment */
|
|
if (xisdigit(*str1)) {
|
|
while (*str1 && xisdigit(*str1)) str1++;
|
|
while (*str2 && xisdigit(*str2)) str2++;
|
|
isnum = 1;
|
|
} else {
|
|
while (*str1 && xisalpha(*str1)) str1++;
|
|
while (*str2 && xisalpha(*str2)) str2++;
|
|
isnum = 0;
|
|
}
|
|
|
|
/* save character at the end of the alpha or numeric segment */
|
|
/* so that they can be restored after the comparison */
|
|
oldch1 = *str1;
|
|
*str1 = '\0';
|
|
oldch2 = *str2;
|
|
*str2 = '\0';
|
|
|
|
/* this cannot happen, as we previously tested to make sure that */
|
|
/* the first string has a non-null segment */
|
|
if (one == str1) return -1; /* arbitrary */
|
|
|
|
/* take care of the case where the two version segments are */
|
|
/* different types: one numeric, the other alpha (i.e. empty) */
|
|
/* numeric segments are always newer than alpha segments */
|
|
/* XXX See patch #60884 (and details) from bugzilla #50977. */
|
|
if (two == str2) return (isnum ? 1 : -1);
|
|
|
|
if (isnum) {
|
|
/* this used to be done by converting the digit segments */
|
|
/* to ints using atoi() - it's changed because long */
|
|
/* digit segments can overflow an int - this should fix that. */
|
|
|
|
/* throw away any leading zeros - it's a number, right? */
|
|
while (*one == '0') one++;
|
|
while (*two == '0') two++;
|
|
|
|
/* whichever number has more digits wins */
|
|
if (strlen(one) > strlen(two)) return 1;
|
|
if (strlen(two) > strlen(one)) return -1;
|
|
}
|
|
|
|
/* strcmp will return which one is greater - even if the two */
|
|
/* segments are alpha or if they are numeric. don't return */
|
|
/* if they are equal because there might be more segments to */
|
|
/* compare */
|
|
rc = strcmp(one, two);
|
|
if (rc) return (rc < 1 ? -1 : 1);
|
|
|
|
/* restore character that was replaced by null above */
|
|
*str1 = oldch1;
|
|
one = str1;
|
|
*str2 = oldch2;
|
|
two = str2;
|
|
}
|
|
|
|
/* this catches the case where all numeric and alpha segments have */
|
|
/* compared identically but the segment sepparating characters were */
|
|
/* different */
|
|
if ((!*one) && (!*two)) return 0;
|
|
|
|
/* whichever version still has characters left over wins */
|
|
if (!*one) return -1; else return 1;
|
|
}
|